Properties
Is color a qualitative property or a quantitative property?
qualitative
What happens to energy in an exothermic reaction?
Energy is released
Some metals react with acid and produce bubbles. Is this an example of a physical property or a chemical property?
chemical property
Which law states that energy cannot be created or destroyed?
The Law of Conservation of Energy
What is flammability?
the ability of a substance to burn easily
What is density?
the amount of mass per unit volume of a substance
What happens to atoms in a chemical reaction?
bonds break; atoms rearrange and form new bonds
To pull the magnets apart, you had to add energy. Was energy absorbed or released?
absorbed
True or False: When an endothermic reaction occurs and the substance becomes cold, energy is being destroyed.
False
The amount of space matter takes up is called _____________.
volume
Physical characteristics that can be measured are called ________________ characteristics.
quantitative
How do you know that a chemical reaction has occurred?
a new substance has formed, and you cannot reverse the reaction
Describe how someone could measure the exact volume of a thumb tack.
Measure water in a graduated cylinder, then put the thumb tack in. Measure the new volume and subtract to find the difference.
True or False: Your mass is exactly the same on the moon as on the earth.
True
What is a subscript?
The tiny number beside an element symbol that tells you how many atoms there are of that element
Is boiling point a physical property or a chemical property?
physical property
In the following reaction, what is/are the reactant(s)?
O2 + 2H2 ---> 2H2O
O2 and H2
When we mixed citric acid and baking soda together, the reaction became very cold. Which type of reaction is this an example of?
Endothermic reaction
The total mass of the reactants equals the total mass of the products.
What do we call the new substance(s) formed from a chemical reaction?
product(s)
False
In the following reaction, what is the coefficient for oxygen gas?
CH4 + 2O2 ---> 2H2O + CO2
2
Explain why the total weight of the flask decreased after we mixed baking soda and vinegar together.
One of the products was carbon dioxide, a gas that escaped the flask.
What is chemical potential energy?
Energy stored within the chemical bonds of a substance
When a substance reacts with oxygen, we call it ____________.
oxidation